Lesson IX.] 



NATURAL HISTORY. 



P. The nautilus, and cuttle-fish. 

 [The pupil should name the peculiarities of 

 both these example*.] 



126. T. Wh.it is the second class called ? 

 P. PTEROPODES, or fin-footed animals. 



127. T. State the peculiarities of this 



P. Cuvicr says that, like the cepha- 

 lopodes, they " swim in the ocean, but can 

 neither fix themselves to any object, nor 

 crawl on the ground, because they are 

 without feeL They move from place to 

 place by means of tins, placed like wings 

 on each side of the mouth." 



128. T. Name the third class. 



P. They are called GASTEROPODES, or 

 animal* that move on their stomachs, such 

 as snails and .-lugs. 



T. State something more about 

 this class. 



P. It is divided into nine orders, 

 containing many species, some of which 

 are entirely naked; others have a concealed 

 shell ; but the greater number a complete 

 covering as snaiK, which shelter 

 from the .vt .( kx of other animals. Most 

 of those that live in the water have an 

 optrctilum, or little door, attached, which 

 protects the animal when it has retreated 

 within the - 



130. T. What animals with shells are 



d in this class ? 



/'. ! : I ivalvft; or mollus- 



cous animals with shell* in one \ . 



do you call the fourth 

 elass? 



P. ATI. IMI u.rs. or animals without 

 heads. Thin is n-*' rcct, as they 



have heads. 



T. Give me an example of this 



-, mussels, and all bivalve 

 oca. 

 133. 7*. What do you mean by bivalve 



Soft-bodied animals, with shells in 

 two pieces, 



mny orders are tl 



/' IA i. .irrpkalaUttactai and 2, 



Acrphnln nn, in 



7'. What is the difference 1 



P. The former have protecting shells; 

 and the latter are naked, or without shells. 



136. T. What is the name of the fifth 

 class of the Mollusca? 



P. BRACHIOPODES, or animals with 

 arm-feet ; but we do not know much about 

 them, except that they have two fleshy 

 arms, furnished with numerous filaments, 

 which they can protrude from and draw 

 within the shell when they please; the 

 mouth is situated between these arms. 



137. T. What is the sixth class called ? 

 P. CIRRHOPODES, or animals with hair 



feet, like the barnacles (Lrpat), which at- 



tnrh thnmclves to ships and posts by long 

 fleshy M. ms In c \^ class we also have 

 in-shells (balantu). The principal 

 part of the shell consists of a hai 

 with sn opening at the narrower pai . 

 or leas closed by two or lour valves. 



KAL QUESTIONS ON LE89O 



1 Vfhatbl ft he second great 



n of the uniinal I 



V- Bunch of LtjMuAt 

 to part of a j.ir. 



